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I think you have the right idea for how to start with the App Framework. There are a couple of things I noticed:

Your views have templates which are missing closing tags, you probably want to add these so the HTML is correct. Also in the render methods, you generally shouldn't have to worry about view appending itself to the body; the thing constructing the view (e.g. the app) should worry about appending the view's `container` node somewhere in the visible DOM.

The user guide for the App component has been updated with some best practices that you'll find useful:
http://yuilibrary.com/yui/docs/app/#best-practices